Spindle for spinning frames



I Dec. 23, 1952 J. E. ROEDER 2,622,388

SPINDLE FOR SPINNING FRAMES Fi'led June '7, 1950 -V//IIIIIII1 m r d Patented Dec. 23, 1952 UNITED s TE OFFICE SPINDLE FOR SPINNING "FRAMES Application June 7, 1950, Serial No. 166,699 In France September 23, 1949 1 Claim.

.This invention relates to spindles for spinning frames.

In the operation of ring spinning frames the point where the breakage of the yarn is most apt to ,occur is at the nip of the front drawing rolls where the attenuated strand is delivered after it has been properly drafted. This is due to the fact that at this point the drafted strand has very little twist and hence has insufiicient strength to withstand properly the pulling force exerted on the yarn end by the traveler.

In order to relieve the yarn at this point from undue strain, it has been proposed to pass the yarn end several times around the tip of the spindle thereby producing suffioient friction between the yarn end and the spindle tip to localize the majorportion-of the traction or pulling strain to which the yarn is subjected in that portion of the yarn between the spindle :tip and the traveler. By this means the portion of the yarn end between the spindle tip and the front drawing rolls is subjected to only a small portion of such pulling strain.

To provide for maintaining the requisite number of turns of yarn around the tip of the spindle during the spinning process, it has been proposed to provide said tip at-its end with vertical notches in which the yarn end is received. However it sometimes happens that the yarn end misses the notches or becomes displaced therefrom with the result that the number of turns of yarn about the spindle tip becomes reduced to such an extent that an increased proportion of the traction or pulling strain on the yarn induced by the traveler is transmitted to the portion of the yarn between the spindle tip and the front drawing rolls thus increasing the danger of breakage of the yarn at the point of its delivery from said front drawing rolls.

An object of the present invention is to provide improvements in spindles by which the required number of turns of the yarn end around the spindle tip will be maintained thereby eliminating the danger of the yarn being broken at its point of delivery from the front drawing rolls.

In the drawings, wherein I have illustrated a selected embodiment of the invention,

Fig. l is a more or less diagrammatical view showing a spindle embodying the present invention.

Fig. 2 is an enlarged side view of the upper end of the nose portion of the spindle.

Fig. 3 is a. side view of Fig. 2.

Fig. 4 is a top plan view of the spindle.

Referring to Fig. 1, b and indicate the front drawing rolls of the drafting section of a ring spinning frame, 0 being the bottom driven .roll and b being the upper pressure roll, 9 indicates a spindle on which is mounted a bobbin h to receive the spun yarn mass .1, 1 indicates the spinning ring of the spinning frame and ,f indicates the traveler mounted on said ring. 41 indicates the thread guide situated between the drawing rolls and the spindle and through which the yarn end passes.

In accordance with the present invention, the spindle g is provided with an extension or nose portion 6, the end m of which is enlarged slightly, and said nose portion is formed at its tip end with two fiat surfaces e 6 said surfaces converging slightly toward the end .of the spindle but having their end edges widely separated from each other, as shown in Figs. 3 and l.

The flat surfaces c e are widest at the tip of the spindle nose portion, .as indicated at it, because of the enlarged end 01 and the ,width of each flat surface at its widest point :kis very nearly the same as the diameter .of the .spindle nose immediately below the enlarged end portion.

The side wall portions ,p of the enlarged nose portion m between the edges of the fiat surfaces e e present segments of a cylindrical surface which is concentric with the axis of the spindle, and because of the wide separation of such flat surfaces where they cut the enlarged nose portion m, said segments span arcs of generous proportion.

The yarn 11, passes from the front drawing rolls b, c to and through the thread guide (2 and thence passes down along one of the flat faces e e and makes the requisite number of turns about the nose portion 6 of the spindle and thence passes to the traveler and to the yarn mass i.

It is important that the thread guide 01 should be positioned closely adjacent to the end of the nose of the spindle as shown in Fig. 1 so that said guide will operate to maintain the yarn in contact with one of the flat faces.

The thread guide at may be of the usual pigtail variety, but it is desirable that the opening or eye of this thread guide shall be as small as possible and yet permit the yarn to pass freely therethrough, and it has been found that a pigtail guide made of piano wire having a diameter of approximately 1 mm. gives excellent results.

The thread guide is mounted with its thread-- receiving opening in axial alinement with the spindle, and as stated above, it is important that said thread guide should be so adjusted that the thread-receiving opening therein is very close to the end of the spindle nose because by this arrangement, said thread guide will maintain the yarn end passing therethrough in contact with the widened portion 7:: of one of the flat surfaces of the spindle nose and hence the desired number of turns of the yarn end around the spindle nose will be at all times maintained. As stated above, the curved surfaces p of the enlarged portion 121. of the spindle nose which are located between the edges of the wider portions is of the flat surfaces e e are segments of a cylindrical surface concentric with the spindle axis, and as shown in Fig. 2 of the drawings, said curved surfaces project only slightly beyond said edges.

This fact, together with the fact that the width of fiat surfaces e e at their widest portions is is very nearly the same as the diameter of the portion of the spindle nose e around which the yarn passes, has certain definite advantages.

During the spinning operation the yarn which is being fed over the wide end portion is of one of the flat surfaces e elmay roll off from said wide end portion is and pass around on to the other flat surface is over the intervening surface 1c of the enlarged end m. With the construction herein shown this operation will take place without subjecting the yarn to any undue strain which is likely to cause breakage thereof. Since the convexly curved segments p of the surface of the enlarged end m are segments of a cylindrical surface, and since such segments project only slightly beyond the edges of the widest portion is of the fiat faces e c and therefore since the width of the flat surfaces at their widest portion 7a is at most only slightly greater than the diameter of the spindle nose immediately below the enlarged end m, the passing of the yarn off from either flat surface It around the adjacent surface 12 onto the other flat portion k is accomplished without subjecting the yarn to any very appreciable increased strain so that said passage from one flat surface to the other is an easy passage.

In the operation of spinning the ballooning of the yarn end takes place between the nose of the spindleand the traveler f. The friction between the turns of the yarn end and the spindle '4 nose e prevents to a great extent the transmission of the traction or pulling strain exerted by the traveler on the yarn to the portion n thereof between the thread guide and the drawing rolls, thereby reducing to a minimum the danger of the yarn end being broken at the nip of said rolls.

I claim:

In a ring spinning machine of the type comprising a rotatable spindle around which the yarn being spun makes several turns before it passes to the traveler, the combination with said spindle having a slightly enlarged tip end immediately above the portion around which the yarn passes and also having two oppositely disposed flat surfaces which converge slightly towardthe spindle tip and over one of which the yarn is fed, the upper end edges of said flat surfaces being widely separated and the side wall surfaces of said enlarged tip portion between the edges of the flat surfaces being segments of a cylindrical surface which is concentric with the spindle axis and which span generous arcs, the widest portion of each fiat surface being at the outer end of the enlarged portion of the spindle tip, and having a width approximating the diameter of the spindle immediately below said enlarged portions around which the turns of the yarn pass, whereby if during the spinning operation the yarn rolls off from either flat surface onto the other flat surface, said yarn will not be subjected to any very appreciable strain as it passes around the convexly curved segmental portions of the enlarged spindle end.

JACQUES L. E. ROEDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name 7 Date 2,198,020 Weinberger Apr. 23, 1940 FOREIGN PATENTS Number Country Date 444,061 Great Britain Mar. 13, 1936 

